/*  touch1.c    touch sensor demonstration program;    requires "turtle.c"*/    int LEFT_TOUCH=     14;int	RIGHT_TOUCH=    15;void main(){    while (1) {        forward();                if (digital(LEFT_TOUCH)) {            backward();            sleep(.25);            right();            sleep(.4);        }                if (digital(RIGHT_TOUCH)) {            backward();            sleep(.25);            left();            sleep(.4);        }    }}                    